Fix cross system slur direction bug #16572
Merged
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Resolves: #16571
This is yet another example of our layout system working against us. Because the system works one measure at a time, one system at a time, and so on, if the end chord of a slur is on a different system, the chord has never been laid out yet by the time we're computing the layout of the slur, so we don't know its direction to decide the slur direction. The only way to fix this issue is by hacking it, and anticipating some of the layout operations of the end chord.